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$555+ Cheap flights from London (LON) to Seattle (SEA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/18. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SEA
nov. 29 — dic. 61
sáb. 11/29
sáb. 12/6
1 adult, Economy
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Cheapflights Tip: The best prices from London to Seattle/Tacoma Intl are usually found in January or February, booked 90 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Find flight deals from London to Seattle

Cheapest flights from London to Seattle
Explore the most affordable flight options available from London to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on octubre 30, 2025.

This Gotogate deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 11/2511:55 amLGW - SEA
1 stop13h 05mIcelandair
mar. 12/22:35 pmSEA - LGW
1 stop12h 20mIcelandair
Deal found 10/28$595
This Gotogate deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/158:35 pmLHR - SEA
1 stop28h 25mIcelandair
jue. 1/152:35 pmSEA - LHR
1 stop20h 55mIcelandair
Deal found 10/28$595
This Gotogate deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/1212:15 pmLHR - SEA
1 stop12h 45mIcelandair
mié. 11/192:35 pmSEA - LHR
1 stop20h 55mIcelandair
Deal found 10/28$599
This Gotogate deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 11/118:35 pmLHR - SEA
1 stop28h 25mIcelandair
mar. 11/182:35 pmSEA - LHR
1 stop12h 15mIcelandair
Deal found 10/28$600
This The Travel House deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure The Travel House is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/28:35 pmLHR - SEA
1 stop28h 25mIcelandair
mar. 12/92:35 pmSEA - LHR
1 stop20h 55mIcelandair
Deal found 10/30$601
This Booking.com deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/2612:15 pmLHR - SEA
1 stop12h 45mIcelandair
mié. 12/32:35 pmSEA - LHR
1 stop20h 55mIcelandair
Deal found 10/29$603
This FlightHub deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/1211:55 amLGW - SEA
1 stop13h 05mIcelandair
mar. 11/182:35 pmSEA - LGW
1 stop12h 20mIcelandair
Deal found 10/30$612
This FlightHub deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 11/118:35 pmLHR - SEA
1 stop28h 25mIcelandair
lun. 11/172:35 pmSEA - LHR
1 stop12h 15mIcelandair
Deal found 10/30$617
This Booking.com deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 11/118:35 pmLHR - SEA
1 stop28h 25mIcelandair
mié. 11/192:35 pmSEA - LHR
1 stop20h 55mIcelandair
Deal found 10/28$618
This Gotogate deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/2711:55 amLGW - SEA
1 stop13h 05mIcelandair
jue. 12/42:35 pmSEA - LGW
1 stop12h 20mIcelandair
Deal found 10/28$627
This Gotogate deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/1311:55 amLGW - SEA
1 stop13h 05mIcelandair
mié. 11/262:35 pmSEA - LGW
1 stop12h 20mIcelandair
Deal found 10/28$632
This Kiwi.com deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/46:00 amLTN - SEA
1 stop19h 00mMultiple Airlines
lun. 12/82:35 pmSEA - LTN
1 stop15h 25mMultiple Airlines
Deal found 10/30$634

Cheap flight deals from London to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from London (LON) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated octubre 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$595
(Gotogate)

One-way from

$555
(Cheapflightsfares)

Popular in

July

Cheapest in

January

Average price

$726

Good round-trip deal

$787 or less

Good one-way deal

$679 or less
Provider with most accurate pricing for London (LON)-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for London (LON)-Seattle/Tacoma Intl flights.
Search Deals
From London (LON) to Seattle/Tacoma Intl
Search Deals
One-way flight from London (LON) to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($104 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals
Price to beat on a round-trip flight from London (LON) to Seattle/Tacoma Intl.
Search Deals
Price to beat on a one-way flight from London (LON) to Seattle/Tacoma Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from London to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated octubre 30, 2025.
Use the filters below to find and compare flights from London to Seattle that are best for you.

Fly from

London

Fly to

Seattle

Route

Depart

Return

Price

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

mié. 11/12

11:55 am-5:00 pm

1 stop13h 05m

Seattle/Tacoma Intl

mié. 11/19

2:35 pm-10:55 am

1 stop12h 20m

$635

LondonSeattle

LTN - SEA

LTNSEA

London Luton

jue. 12/4

6:00 am-5:00 pm

1 stop19h 00m

Seattle/Tacoma Intl

lun. 12/8

2:35 pm-2:00 pm

1 stop15h 25m

$637

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

mié. 11/12

12:15 pm-5:00 pm

1 stop12h 45m

Seattle/Tacoma Intl

jue. 11/20

2:35 pm-10:50 am

1 stop12h 15m

$639

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

mar. 12/16

8:35 pm-5:00 pm

1 stop28h 25m

Seattle/Tacoma Intl

mié. 1/14

2:35 pm-7:30 pm

1 stop20h 55m

$641

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

mié. 2/25

11:45 am-11:40 am

1 stop31h 55m

Seattle/Tacoma Intl

mié. 3/4

4:45 pm-10:30 am

Nonstop9h 45m

$653

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

mié. 2/25

11:45 am-11:40 am

1 stop31h 55m

Seattle/Tacoma Intl

mar. 3/10

8:20 pm-12:50 pm

Nonstop9h 30m

$653

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

jue. 2/26

6:30 am-11:40 am

1 stop13h 10m

Seattle/Tacoma Intl

dom. 3/8

5:40 pm-10:30 am

Nonstop9h 50m

$661

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

mié. 2/25

6:30 am-11:40 am

1 stop13h 10m

Seattle/Tacoma Intl

vie. 3/6

4:45 pm-10:30 am

Nonstop9h 45m

$662

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

lun. 2/9

2:55 pm-4:55 pm

Nonstop10h 00m

Seattle/Tacoma Intl

mié. 2/18

7:00 am-11:40 am

1 stop20h 40m

$666

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

jue. 2/5

2:55 pm-4:55 pm

Nonstop10h 00m

Seattle/Tacoma Intl

mié. 2/18

7:15 am-10:25 am

1 stop19h 10m

$666

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Showing 1-10 of 60 results
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Compare providers for flights from London to Seattle

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from London to Seattle in October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
AranGrantPrice Accuracy2 starsTrust Score*3 stars
Thrive TravelPrice Accuracy3 starsTrust Score*1 star
PricelinePrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on London-Seattle flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on London-Seattle flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from London-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on London-Seattle flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from London to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from London with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from London to Seattle

How far ahead should I book a flight from London to Seattle?

Use this chart to determine the optimal time to book a round-trip flight from London to Seattle. Price data was last updated on October 24, 2025.

To ensure you get the cheapest price possible for a flight from London to Seattle, you should look to book at least 90 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from London to Seattle?

Currently, March is the cheapest month in which you can book a flight from London to Seattle (average of $410). Flying from London to Seattle in August is currently the most expensive (average of $617). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from LON to SEA?

Find hourly flight availability from London to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated octubre 30, 2025.

One of the essential ways to save on airfare from London to Seattle is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight at noon could potentially save you up to 22% on airfare.

What is the cheapest day to fly from London to Seattle?

Use this chart to determine the cheapest time to fly round-trip from London to Seattle. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their London to Seattle flight should consider departing on Monday mornings when fares are most often at their lowest. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost to fly round-trip from London to Seattle?

What’s the top layover airport for flights from London to Seattle?

Share of 1-stop round-trip flights from London to Seattle chosen by Cheapflights users in the past 12 months, using the same layover each way.

Denver (DEN) – chosen by Cheapflights users on 50% of 1-stop itineraries from London to Seattle on Cheapflights.

What’s the cheapest layover airport for flights from London to Seattle?

Average round-trip fare for 1-stop flights from London to Seattle, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Reykjavik (KEF) is the most affordable 1-stop option, with an average round-trip price of $497.

What’s the fastest layover option from London to Seattle?

Shortest average travel time for 1-stop one-way flights from London to Seattle, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Denver (DEN) have the shortest average one-way travel time for 1-stop routes: 14h 24m.

Which airport typically offers the quickest layover for flights from London to Seattle?

Average layover duration for 1-stop one-way flights from London to Seattle, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Denver (DEN) offer the fastest connection on this route, with an average layover time of 1h 25m.

The best insider tips for London to Seattle flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your London to Seattle trip
Airports
LHR

For a smooth departure from Heathrow, ensure all liquids are in one small bag to avoid lengthy security checks.

Read more about LHRby Ramsey Qubein
SEA

Use the Link light rail from SEA to downtown Seattle for an affordable, 40-minute journey with ample luggage space.

Read more about SEAby Brandon Schultz
Our travel experts
Ramsey Qubein

Ramsey Qubein

Expert on LHR

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more
Brandon Schultz

Brandon Schultz

Expert on SEA

Brandon Schultz

Brandon Schultz

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Read more

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated octubre 30, 2025.
See what other customers who have flown with Delta, Virgin Atlantic, and Icelandair from London to Seattle have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
7,993 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Mary,Oct 2025

AMS - PDX

It's specail being able to fly non-stop from Amsterdam all the way home to Portland, Oregon!
Delta
7.9
Good
7,993 reviews
Delta
7.9
Good
7,993 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Mary,Oct 2025

AMS - PDX

It's specail being able to fly non-stop from Amsterdam all the way home to Portland, Oregon!
Virgin Atlantic
7.5
Good
670 reviews
Delta
7.9
Good
7,993 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Mary,Oct 2025

AMS - PDX

It's specail being able to fly non-stop from Amsterdam all the way home to Portland, Oregon!
Icelandair
7.1
Good
562 reviews
Delta
7.9
Good
7,993 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Mary,Oct 2025

AMS - PDX

It's specail being able to fly non-stop from Amsterdam all the way home to Portland, Oregon!
Iberia
7.0
Good
3,001 reviews
Delta
7.9
Good
7,993 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Mary,Oct 2025

AMS - PDX

It's specail being able to fly non-stop from Amsterdam all the way home to Portland, Oregon!
British Airways
6.7
Okay
7,487 reviews
Delta
7.9
Good
7,993 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Mary,Oct 2025

AMS - PDX

It's specail being able to fly non-stop from Amsterdam all the way home to Portland, Oregon!

Related info for your journey

Find useful and relevant information for your journey from London to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Seattle from London?

    Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly into when you book flights from London to Seattle. 5 airlines have flights to Seattle/Tacoma Intl from London on a regular basis. Booking flights from London to Seattle/Tacoma Intl should not be difficult; the airport handles an average of 5 inbound flights from London per day.

  • How long is the flight from London to Seattle?

    For as low as $635, Icelandair can have you in Seattle from London in 13h 05m. The distance from London to Seattle is about 4807 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from London to Seattle round-trip?

    Cheapflights users have booked flights from London to Seattle round-trip from $418. Other airlines that can offer you cheap pricing are British Airways, from $553, and American Airlines, from $589. Icelandair is currently priced 43% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from London to Seattle one-way?

    One-way options have recently been found by users for as low as $560 on British Airways. Other airlines that offer cheap prices include United Airlines from $563 and Finnair from $566 one-way.

  • What are the most popular routes from London to Seattle?

    Most travelers choose London Heathrow - Seattle/Tacoma Intl, London Gatwick - Seattle/Tacoma Intl or London City - Seattle/Tacoma Intl when deciding on the best route from London to Seattle.

  • What are the most reliable airlines from London to Seattle?

    The top 3 most reliable airlines when flying from London to Seattle are Scandinavian Airlines (95%), KLM (87%) and Air France (87%).

  • What are the cheapest flights from London to Seattle?

    While on average a flight from London to Seattle is generally $2,172, our data shows the cheapest flight currently is $592. When looking at the most popular route, (London Heathrow - Seattle/Tacoma Intl), you can expect to pay $529 for that flight.

  • Can I find deals for flights from London to Seattle that include hotel bookings?

    Yes. In addition to deals on London to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from London to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Seattle.

  • Can I find deals for business class flights from London to Seattle?

    Yes. Cheapflights offers flight deals from London to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from London to Seattle?

    Currently, March is the cheapest month in which you can book a flight from London to Seattle (average of $410). Flying from London to Seattle in August is currently the most expensive (average of $617). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
Tukwila
Tacoma
Lakewood
Olympia
Ocean Shores
Lynnwood
Edmonds
Leavenworth
Renton
Kirkland
Lacey
Kent
Federal Way
Cle Elum
Marysville
Puyallup
Chehalis
Fife
Issaquah

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for London to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from London to Seattle

Discover the top 5 airlines that operate flights from London to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated octubre 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$418Average$771FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$553Average$751FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$589Average$813FlexibilityNo cancel feeOn-time71%
Virgin AtlanticCheapest$594Average$878FlexibilityNo cancel feeOn-time72%
DeltaCheapest$594Average$826FlexibilityNo cancel feeOn-timeN/A

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